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Continental TiresRoad Clincher TiresContinental is a German maker of both automobile and bicycle tires, having been a maker of bike tires since 1892. In the past few years many road racing riders have adopted Continental tires for sport riding, training and racing. Though they make some popular tubular tires we confine ourselves to selling just two families of their road racing clincher tires. They are the Super Sport Ultra, and the Grand Prix series tires. Both families of Continental tires have a Skin sidewall which has a slightly darker rubber color than is used by the Japanese tire makers. Both series of tires also have Kevlar beaded versions. The ads for Continental tires state that the tires use a polyamide fabric for the tire casing fabric. Unless you shop in Europe, you wouldn't be familiar with the term "polyamide", which is the term or name given to nylon based materials. To remove the ambiguity, remember that "polyamide" is a nylon based plastic fabric. Continental tires are said to use a tread that is "composed of a natural rubber compound". The same Continental ad material in a discussion of their Butyl tubes says that they are, "Made with pure, natural, virgin butyl rubber". In our overview's discussion of butyl rubber we make clear that it's synthesized of chemical derivatives from petroleum which don't occur in nature, so their definition of the "natural" remains uncertain. The use of latex rubber in conjunction with a synthetic rubber is well known but the exact composition of this tread compound remains unknown. |
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In-depth Information About Metals Aluminum Aluminum is extracted electrolytically from bauxite ore. It is made by the electrolysis of aluminum oxide which is found in larger concentrations within bauxite ore. Bauxite is a mixture of the hydroxides of aluminum, together with other impurities such as oxides of iron, titanium, and silicon. Bauxite is produced by the weathering and change of aluminum silicate rocks usually found in tropical and semitropical regions where climate has produced an accelerated weathering process. Bauxite is not a rare ore and is widely available in the US, the Caribbean, and Europe. Approximately 4 pounds of read the full article... Beryllium Beryllium is a specialty metal that is steel-grey metal in color, with an extremely low density, making it very light weight. At 1.85 grams to the cubic centimeter, its density compares to that of magnesium. It is also a high strength metal, making it possible to design light weight, thin membered parts with ahigh stiffness. A column made of beryllium to support a load placed directly downward on top of it, will have a greater load carrying capacity, and be lower in weight than any other metal of equal size. Until the 1950's beryllium was used read the full article... Titanium The element titanium was discovered in 1763 by an English cleric, William Gregor who was an amateur chemist with an inquiring mind. It was in the black sands of Cornwall that he discovered the new element that had up to that time, attracted little scientific interest. A few years later, an Austrian, Klaproth, extracted the same element from an ore widely known as "rutile", which is a mineral consisting of titanium dioxide (one titanium atom, two oxygen atoms), that is a reddish-brown substance with a slight metallic luster. While rutile is the highest grade read the full article... Metallurgic Hardness Testing There are three types of tests used with accuracy by the metals industry,they are the Brinell hardness test, the Rockwell hardness test, and the Vickers hardness test. Hardness is the property of a metal which gives it the ability to resist being permanently deformed (bent, broken, or have its shape changed), when a load is applied. The greater the hardness of the metal, the greater resistance it has to deformation. Since the definitions of metallurgic ultimate strength and hardness are rather similar, it can generally be assumed read the full article... |
